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(No Model.)

H. M. CARROLL. ARTIFICIAL TOOTH.

No. 597,999. Patented Jan. 11, 1898.

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HOUSTON MONROE CARROLL, OF SAN ANTONIO, TEXAS, ASSIGNOR OF ONEI-IALF TO AMES P. OLDHAM, OF SAME PLACE.

ARTIFICIAL TOOTH.

SPECIFICATION forming part of Letters Patent No. 597,099, dated January 1 1, 1898.

Application filed July 21, 1897.

To all whom it may concern:

Be it known that I, HOUSTON MONROE CAR- ROLL, a citizen of the United States, residing at San Antonio, in the county of BeXar and State of Texas, have invented a new and useful Artificial Tooth, of which the following is a specification.

This invention relates to means, which hereinafter will be more fully set forth and claimed,for supplying missing teeth or crowniug roots, whereby repairs to single teeth or bridgework can be made with despatch, coinparative case to the patient, and at a small cost.

For a full understanding of the merits and advantages of the invention reference is to be had to the following description and drawings hereto attached, in which- Figure l is a side elevation showinga natural tooth crowned in accordance with the principles of this invention. Fig. 2 is a rear view thereof. Fig. is a perspective View of the crown. Fig. 4 is a detail view of the root, having the base or pin in position, parts being broken away. Fig. 5 is a detail perspective view showing the invention applied to bridgework. Fig. 6 is a detail view in perspective of the bridge-crown. Fig. 7 is a detail View in perspective of the bridge, the latter being inverted.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same referencecharacters.

In practicing the invention a suitable base is provided, the form depending upon the character of the work and varying according to the style of crown to be placed in po sition. For single teeth or crowning roots the base 1 is provided with a pin or stem 2, which is inserted in an opening drilled into the root 3 after the latter has been faced. This pin or stem 2 maybe plain or screwthreaded, as desired. A dovetailed projection at is formed with or applied to the outer side of the base 1 and extends at right angles to the line of the biting edge of the teeth, so as to withstand the strain coming upon the crown when in the act of biting or during the process of mastication. In the event of the pin or stem 2 being screw-threaded the Serial No. 645,410. (No model.)

end of the dovetailed projection l will be longitudinally grooved, as indicated at 5, for the reception of a screw-driver or like instrument to enable the pin to be screwed into the canal or opening in the root. Obviously a suitable instrument maybe applied to the projection i when screwing the pin home or loosening it; but it is preferred to provide the groove 5, as a much smaller instrument can be used to advantage for placing the stem in position or removing it when required. This groove 5 lightens the projection and provides an increased surface for the cement employed for securing the crown 6 to the base.

The crown 6, which maybe of porcelain or any material generally employed in the for mation of artificial teeth, is provided at its upper end with a projection '7 and a dovetailed recess 8, the latter conforming to the outline of the projection 4, so as to interlock therewith. The projection '7 closes the inner end of the recess 8 and overlaps the outer end of the projection i and conceals the interlocking joint formed between the base and the crown, whereby the work when completed presents a neat and finished appearance.

When the invention is used in connection with bridgework,the base 10 is seen red to a cap or band 11 to be fitted to a tooth adjacent to the space to be filled by inserting an artificial tooth. This base 10 is provided on its outer end with a dovetailed projection 12, corresponding with a similarly-formed recess 13 in the end of the crown 14, said crown having a projection 15 to overlap the joint formed between the base and crown,thereby concealing the base and presenting approximately the appearance of a natural tooth.

A vital feature of the invention is the interlocking dovetailed recess and projection formed between the opposing ends of the crown and base and having the same extending transversely and at right angles to the biting edge,whereb y the joint is best adapted for sustaining the strain without loosening or giving Way. In the event of the crown breaking it can be readily replaced by cementing it to the base and by means of the interlocking joint. This feature can be applied to platework of gold, silver, platinum, rubber, and celluloid, theplate constituting the base and the teeth having the recess and projection whereby the interlocking joint between them and the base is had without ing edge, and a crown having a recess across itsend of corresponding shape to the aforesaid dovetailed projection to snugly receive it, and disposed at right angles to the biting edge, substantially as and for the purpose set forth.

2. In artificial teeth, the combination of a base having a threaded stem to enter an opening drilled into the root to be crowned, and having a dovetailed projection extending at right angles to the biting edge, constructed to have an instrument fitted thereto for screw ing the aforesaid stem home, and a crown having a recess at its inner end corresponding to and snugly receiving the dovetailed projection, and having a vertical projection at its front side overlapping the joint formed between the opposing or meeting parts of the base and crown, substantially as set forth for the purpose specified.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

HOUSTON MONROE CARROLL.

Witnesses:

JNo. R. Simon, WYATT JAMES. 

